[FEAT]: Authentication - Refresh Token & Logout

[buka4rill]

Acceptance Criteria [WIP]

Refresh Token

1. Refresh Token Issuance

• Given a valid login, when the user successfully logs in, then the system should generate and return both an access token and a refresh token.
• The refresh token should have a longer expiry time compared to the access token (e.g., 7 days or more).

2. Storing Refresh Tokens

• Given a successful login, when the system generates a refresh token, then the token should be stored securely (e.g., in a database with the user record).

3. Using Refresh Tokens

• Given an expired access token and a valid refresh token, when the user requests a new access token, then the system should verify the refresh token and issue a new access token.

4. Revoking Refresh Tokens

• Given a user logout request, when the user logs out, then the system should invalidate the refresh token to prevent its future use.

Refresh Token Endpoint

1. Token Refresh Endpoint

• The system should provide an endpoint to request a new access token using a valid refresh token.

2. Validation of Refresh Token

• Given a request with an invalid refresh token, when the user tries to get a new access token, then the system should return a 401 Unauthorized status.
• Given a request with an expired refresh token, when the user tries to get a new access token, then the system should return a 401 Unauthorized status.

Security Measures

1. Token Rotation

• Given a request for a new access token using a valid refresh token, when the system issues a new access token, then it should also issue a new refresh token and invalidate the old one.

2. Single-Use Refresh Tokens

• Each refresh token should be designed to be single-use, meaning it becomes invalid after being used to obtain a new access token.

3. Refresh Token Expiry

• The refresh token should have an expiry time, and upon expiry, the user must re-authenticate (login) to get a new refresh token.

Error Handling for Refresh Tokens

1. Invalid or Expired Refresh Tokens

• Given a request with an invalid or expired refresh token, when the user tries to refresh the access token, then the system should return a 401 Unauthorized status with an appropriate error message.

Documentation for Refresh Tokens

1. API Documentation

• The system should have documentation (e.g., Swagger) detailing the refresh token endpoint, request formats, and responses.
• The system should have documentation for logout endpoint

Testing

1. Unit Tests

• The system should have unit tests covering refresh token logic
• The system should have unit tests covering logout logic

[buka4rill]

This issue should be done before this is implemented